3-axis step motor controller and driver PCB Phase currents between 0.2 to 1.5 Amps/Phase (Software Programmable) Software selectable step resolutions from Full step, Half step, and 4x, 8x, 16x, 32x, 64x microstepping operation. On-board control interfaces are provided for both RS232, for single module control and RS485 for multiple module control. Operating at 57,600 baud the coordinated control of up to twelve axes is practical using four R364 PCB modules on a common RS485 bus. Up to 15.6kHz of step frequency Left and Right limit switch inputs for all motors Home reference by commanded automatic sequence for each motor. The Left Limit Switch is found. The motor then moves to a user given offset position, and then sets the current position to be zero. Eight inputs 0 to 5 VDC analog, or eight inputs TTL digital Seven open-collector relay or solenoid drivers, and one TTL output $99 per axis - for 100 pcs quantity